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Schedule of Loan to Directors Officers and Affiliated Parties (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($)
Receivables [Abstract]
Balance at December 31, 2023	$ 13,056
New loans	3,500
Repayments	(2,364)
Balance at December 31, 2024	$ 14,192

X

- Definition

Issuance of loans and unfunded commitments.

+ References

No definition available.

+ Details

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Namespace Prefix:	LARK_
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Balance Type:	credit
Period Type:	duration

X

- Definition

Loans and unfunded commitments.

+ References

No definition available.

+ Details

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Namespace Prefix:	LARK_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Proceeds from loans and unfunded commitments.

+ References

No definition available.

+ Details

Name:	LARK_ProceedsFromLoansAndUnfundedCommitments
Namespace Prefix:	LARK_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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